SU81225A1 - Contactless starter for three-phase motors - Google Patents

Description

A contactless d-h three-phase motor starter is offered, which is made in a single-wire float of non-intermittent inductance with positive windings or moving parts of the magnetic circuit.

The starters of the same kind, allowing the unit to start, smoothly adjust the speed, stop and reverse the engine, are generally known, but the proposed starter is more complex and simple, which is achieved by running the windings on the four poles of the eighth pole cylindrical stator (rotor) and using two magnetic conductors and the use of two magnetic conductors and the use of two magnet wires. redistributing notes between the poles of the stator (or rotor).

On the fng, 1 n 2 two projections of the proposed starter are shown (one option), and on the fng. 3-scheme of starting the starter together with an asynchronous short-circuited electric motor.

The starter is made in the form of a two-phase throttle, (Fng. I and 2) having two primary windings secondary n 4. The windings are located on a cylindrical rotor 5, which has eight poles: four main-6, 7, 8 and 9 and four auxiliary-10 , //, 12 and / ..

The latter are designed to eliminate the interaction of magnetic forces n in order to reduce the no-load current of the actuator to a minium.

The starter stator consists of two magnet tubes M. 15 and a shifter 16, which are used for the non-distribution of magnetic flux by the rotor poles.

The rotor can also be made with the location of the windings and zerouses on the stator, and the 14 n / 5 magnetic circuits on the rotor.

The primary windings / and 2 actuators (FNG. 3) are connected to two phases / and // of the threading network; The third phase of the network is connected to the primary winding of a single-phase transformer 17. The ends of all these windings are connected to one point 18. The secondary windings and the 4 UTOpi-iMHoii starters are connected to the windings of the transformer / 7 to the stator winding of the electric motor 19, the ends of their transformers are wrapped in 2G .

To eliminate the auxiliary action of the auxiliary poles in the working position of the puosatel (Fig. 2), slots 2/22 are provided on the stator.

The position of the actuator as shown in FIG. 3, the stator of the electric motor / 9 is supplied with the voltage of only one phase ///, as a result of which it will not create a rotating moment. As the rotor of the 5 starter turns, in the secondary windings 3 and 4. The 15th phase and / and phase phases will be induced by an uninterruptedly E.D.S., which will cause a smooth start of the electrodes) To stop the electric motor, pod rotate the steering wheel of the starter in the right direction. By changing the value of asymmetrical voltages supplied to the engine through the windings of the motor 5, by turning its rotor), it is possible to regulate the speed of the electric motor. At the moment of transition through the zero position, the proclient is forced to re-fasten the phases / n // without changing the current direction. This achieves reversing and practicing; electromagnetically braking the engine.

PREPARATION METHOD

Contactless accelerator for three-phase motors, engineered by I two-phase reactors and inductances with moving windings 1 of parts of the magnetonod and a nosvol 1opiYY to start, smoothly adjust the speed, stop and reverse the engine, characterized in that, for the purpose of a new device, it is necessary to adjust the speed, stop and reverse the motor, which is designed so as to create a new compactness of the device, stop and reverse the motor. on four ilus of an octal 10L10Snogo cylindrical stator (or rotor), at the poles of which the magnetic flux is non-redistricted 11, the magnetic conductor4 forms a .mp. rotor ( tor).

, L: .1ц: а й - :; Д-

(.

CD /, 2 /

/ 4 - bh

- / j

five